/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.facebook.presto.operator;
import com.facebook.presto.block.BlockCursor;
import com.facebook.presto.spi.RecordSink;
import com.facebook.presto.tuple.TupleInfo;
import com.google.common.collect.ImmutableList;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.List;
import static com.facebook.presto.tuple.TupleInfo.SINGLE_LONG;
import static com.facebook.presto.tuple.TupleInfo.SINGLE_VARBINARY;
import static com.facebook.presto.tuple.TupleInfo.Type;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
public class TableWriterOperator
implements Operator
{
public static final List<TupleInfo> TUPLE_INFOS = ImmutableList.of(SINGLE_LONG, SINGLE_VARBINARY);
public static class TableWriterOperatorFactory
implements OperatorFactory
{
private final int operatorId;
private final RecordSink recordSink;
private boolean closed;
public TableWriterOperatorFactory(int operatorId, RecordSink recordSink)
{
this.operatorId = operatorId;
this.recordSink = checkNotNull(recordSink, "recordSink is null");
}
@Override
public List<TupleInfo> getTupleInfos()
{
return TUPLE_INFOS;
}
@Override
public Operator createOperator(DriverContext driverContext)
{
checkState(!closed, "Factory is already closed");
OperatorContext context = driverContext.addOperatorContext(operatorId, TableWriterOperator.class.getSimpleName());
return new TableWriterOperator(context, recordSink);
}
@Override
public void close()
{
closed = true;
}
}
private enum State
{
RUNNING, FINISHING, FINISHED
}
private final OperatorContext operatorContext;
private final RecordSink recordSink;
private State state = State.RUNNING;
private long rowCount;
public TableWriterOperator(OperatorContext operatorContext, RecordSink recordSink)
{
this.operatorContext = checkNotNull(operatorContext, "operatorContext is null");
this.recordSink = checkNotNull(recordSink, "recordSink is null");
}
@Override
public OperatorContext getOperatorContext()
{
return operatorContext;
}
@Override
public List<TupleInfo> getTupleInfos()
{
return TUPLE_INFOS;
}
@Override
public void finish()
{
if (state == State.RUNNING) {
state = State.FINISHING;
}
}
@Override
public boolean isFinished()
{
return state == State.FINISHED;
}
@Override
public ListenableFuture<?> isBlocked()
{
return NOT_BLOCKED;
}
@Override
public boolean needsInput()
{
return state == State.RUNNING;
}
@Override
public void addInput(Page page)
{
checkNotNull(page, "page is null");
checkState(state == State.RUNNING, "Operator is %s", state);
BlockCursor[] cursors = new BlockCursor[page.getChannelCount()];
Type[] types = new Type[page.getChannelCount()];
for (int channel = 0; channel < cursors.length; channel++) {
cursors[channel] = page.getBlock(channel).cursor();
TupleInfo tupleInfo = cursors[channel].getTupleInfo();
checkArgument(tupleInfo.getFieldCount() == 1, "expected block to have exactly one field");
types[channel] = tupleInfo.getTypes().get(0);
}
int rows = page.getPositionCount();
for (int position = 0; position < rows; position++) {
recordSink.beginRecord();
for (int i = 0; i < cursors.length; i++) {
checkArgument(cursors[i].advanceNextPosition());
writeField(cursors[i], types[i]);
}
recordSink.finishRecord();
}
rowCount += rows;
for (BlockCursor cursor : cursors) {
checkArgument(!cursor.advanceNextPosition());
}
}
private void writeField(BlockCursor cursor, Type type)
{
if (cursor.isNull(0)) {
recordSink.appendNull();
return;
}
switch (type) {
case BOOLEAN:
recordSink.appendBoolean(cursor.getBoolean(0));
break;
case FIXED_INT_64:
recordSink.appendLong(cursor.getLong(0));
break;
case DOUBLE:
recordSink.appendDouble(cursor.getDouble(0));
break;
case VARIABLE_BINARY:
recordSink.appendString(cursor.getSlice(0).getBytes());
break;
default:
throw new AssertionError("unimplemented type: " + type);
}
}
@Override
public Page getOutput()
{
if (state != State.FINISHING) {
return null;
}
state = State.FINISHED;
String fragment = recordSink.commit();
PageBuilder page = new PageBuilder(getTupleInfos());
page.getBlockBuilder(0).append(rowCount);
page.getBlockBuilder(1).append(fragment);
return page.build();
}
}